[mirror_ubuntu-jammy-kernel.git] / net / mac80211 / spectmgmt.c

/*
 * spectrum management
 *
 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 * Copyright 2007-2008, Intel Corporation
 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/ieee80211.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "sta_info.h"
#include "wme.h"

int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
				 struct ieee802_11_elems *elems, bool beacon,
				 enum ieee80211_band current_band,
				 u32 sta_flags, u8 *bssid, u8 *count, u8 *mode,
				 struct cfg80211_chan_def *new_chandef)
{
	enum ieee80211_band new_band;
	int new_freq;
	u8 new_chan_no;
	struct ieee80211_channel *new_chan;
	struct cfg80211_chan_def new_vht_chandef = {};
	const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
	const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
	const struct ieee80211_ht_operation *ht_oper;
	int secondary_channel_offset = -1;

	sec_chan_offs = elems->sec_chan_offs;
	wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
	ht_oper = elems->ht_operation;

	if (sta_flags & (IEEE80211_STA_DISABLE_HT |
			 IEEE80211_STA_DISABLE_40MHZ)) {
		sec_chan_offs = NULL;
		wide_bw_chansw_ie = NULL;
		/* only used for bandwidth here */
		ht_oper = NULL;
	}

	if (sta_flags & IEEE80211_STA_DISABLE_VHT)
		wide_bw_chansw_ie = NULL;

	if (elems->ext_chansw_ie) {
		if (!ieee80211_operating_class_to_band(
				elems->ext_chansw_ie->new_operating_class,
				&new_band)) {
			sdata_info(sdata,
				   "cannot understand ECSA IE operating class %d, disconnecting\n",
				   elems->ext_chansw_ie->new_operating_class);
			return -EINVAL;
		}
		new_chan_no = elems->ext_chansw_ie->new_ch_num;
		*count = elems->ext_chansw_ie->count;
		*mode = elems->ext_chansw_ie->mode;
	} else if (elems->ch_switch_ie) {
		new_band = current_band;
		new_chan_no = elems->ch_switch_ie->new_ch_num;
		*count = elems->ch_switch_ie->count;
		*mode = elems->ch_switch_ie->mode;
	} else {
		/* nothing here we understand */
		return 1;
	}

	new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
	new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
	if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
		sdata_info(sdata,
			   "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
			   bssid, new_freq);
		return -EINVAL;
	}

	if (!beacon && sec_chan_offs) {
		secondary_channel_offset = sec_chan_offs->sec_chan_offs;
	} else if (beacon && ht_oper) {
		secondary_channel_offset =
			ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET;
	} else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
		/* If it's not a beacon, HT is enabled and the IE not present,
		 * it's 20 MHz, 802.11-2012 8.5.2.6:
		 *	This element [the Secondary Channel Offset Element] is
		 *	present when switching to a 40 MHz channel. It may be
		 *	present when switching to a 20 MHz channel (in which
		 *	case the secondary channel offset is set to SCN).
		 */
		secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
	}

	switch (secondary_channel_offset) {
	default:
		/* secondary_channel_offset was present but is invalid */
	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
		cfg80211_chandef_create(new_chandef, new_chan,
					NL80211_CHAN_HT20);
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
		cfg80211_chandef_create(new_chandef, new_chan,
					NL80211_CHAN_HT40PLUS);
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
		cfg80211_chandef_create(new_chandef, new_chan,
					NL80211_CHAN_HT40MINUS);
		break;
	case -1:
		cfg80211_chandef_create(new_chandef, new_chan,
					NL80211_CHAN_NO_HT);
		/* keep width for 5/10 MHz channels */
		switch (sdata->vif.bss_conf.chandef.width) {
		case NL80211_CHAN_WIDTH_5:
		case NL80211_CHAN_WIDTH_10:
			new_chandef->width = sdata->vif.bss_conf.chandef.width;
			break;
		default:
			break;
		}
		break;
	}

	if (wide_bw_chansw_ie) {
		new_vht_chandef.chan = new_chan;
		new_vht_chandef.center_freq1 =
			ieee80211_channel_to_frequency(
				wide_bw_chansw_ie->new_center_freq_seg0,
				new_band);

		switch (wide_bw_chansw_ie->new_channel_width) {
		default:
			/* hmmm, ignore VHT and use HT if present */
		case IEEE80211_VHT_CHANWIDTH_USE_HT:
			new_vht_chandef.chan = NULL;
			break;
		case IEEE80211_VHT_CHANWIDTH_80MHZ:
			new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
			break;
		case IEEE80211_VHT_CHANWIDTH_160MHZ:
			new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
			break;
		case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
			/* field is otherwise reserved */
			new_vht_chandef.center_freq2 =
				ieee80211_channel_to_frequency(
					wide_bw_chansw_ie->new_center_freq_seg1,
					new_band);
			new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
			break;
		}
		if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
		    new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
			ieee80211_chandef_downgrade(&new_vht_chandef);
		if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
		    new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
			ieee80211_chandef_downgrade(&new_vht_chandef);
		if (sta_flags & IEEE80211_STA_DISABLE_40MHZ &&
		    new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
			ieee80211_chandef_downgrade(&new_vht_chandef);
	}

	/* if VHT data is there validate & use it */
	if (new_vht_chandef.chan) {
		if (!cfg80211_chandef_compatible(&new_vht_chandef,
						 new_chandef)) {
			sdata_info(sdata,
				   "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
				   bssid);
			return -EINVAL;
		}
		*new_chandef = new_vht_chandef;
	}

	return 0;
}

static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
					struct ieee80211_msrment_ie *request_ie,
					const u8 *da, const u8 *bssid,
					u8 dialog_token)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *msr_report;

	skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
				sizeof(struct ieee80211_msrment_ie));
	if (!skb)
		return;

	skb_reserve(skb, local->hw.extra_tx_headroom);
	msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
	memset(msr_report, 0, 24);
	memcpy(msr_report->da, da, ETH_ALEN);
	memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(msr_report->bssid, bssid, ETH_ALEN);
	msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						IEEE80211_STYPE_ACTION);

	skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
	msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
	msr_report->u.action.u.measurement.action_code =
				WLAN_ACTION_SPCT_MSR_RPRT;
	msr_report->u.action.u.measurement.dialog_token = dialog_token;

	msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
	msr_report->u.action.u.measurement.length =
			sizeof(struct ieee80211_msrment_ie);

	memset(&msr_report->u.action.u.measurement.msr_elem, 0,
		sizeof(struct ieee80211_msrment_ie));
	msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
	msr_report->u.action.u.measurement.msr_elem.mode |=
			IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
	msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;

	ieee80211_tx_skb(sdata, skb);
}

void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt,
				       size_t len)
{
	/*
	 * Ignoring measurement request is spec violation.
	 * Mandatory measurements must be reported optional
	 * measurements might be refused or reported incapable
	 * For now just refuse
	 * TODO: Answer basic measurement as unmeasured
	 */
	ieee80211_send_refuse_measurement_request(sdata,
			&mgmt->u.action.u.measurement.msr_elem,
			mgmt->sa, mgmt->bssid,
			mgmt->u.action.u.measurement.dialog_token);
}
Commit	Line	Data
39192c0b JB	1	/*
	2	* spectrum management
	3	*
	4	* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
	5	* Copyright 2002-2005, Instant802 Networks, Inc.
	6	* Copyright 2005-2006, Devicescape Software, Inc.
	7	* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
	8	* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
	9	* Copyright 2007-2008, Intel Corporation
	10	* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License version 2 as
	14	* published by the Free Software Foundation.
	15	*/
	16
	17	#include <linux/ieee80211.h>
d3236553	18	#include <net/cfg80211.h>
39192c0b JB	19	#include <net/mac80211.h>
	20	#include "ieee80211_i.h"
	21	#include "sta_info.h"
	22	#include "wme.h"
	23
e6b7cde4 SW	24	int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
	25	struct ieee802_11_elems *elems, bool beacon,
	26	enum ieee80211_band current_band,
	27	u32 sta_flags, u8 bssid, u8 count, u8 *mode,
	28	struct cfg80211_chan_def *new_chandef)
	29	{
	30	enum ieee80211_band new_band;
	31	int new_freq;
	32	u8 new_chan_no;
	33	struct ieee80211_channel *new_chan;
	34	struct cfg80211_chan_def new_vht_chandef = {};
	35	const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
	36	const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
	37	const struct ieee80211_ht_operation *ht_oper;
	38	int secondary_channel_offset = -1;
	39
	40	sec_chan_offs = elems->sec_chan_offs;
	41	wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
	42	ht_oper = elems->ht_operation;
	43
	44	if (sta_flags & (IEEE80211_STA_DISABLE_HT \|
	45	IEEE80211_STA_DISABLE_40MHZ)) {
	46	sec_chan_offs = NULL;
	47	wide_bw_chansw_ie = NULL;
	48	/* only used for bandwidth here */
	49	ht_oper = NULL;
	50	}
	51
	52	if (sta_flags & IEEE80211_STA_DISABLE_VHT)
	53	wide_bw_chansw_ie = NULL;
	54
	55	if (elems->ext_chansw_ie) {
	56	if (!ieee80211_operating_class_to_band(
	57	elems->ext_chansw_ie->new_operating_class,
	58	&new_band)) {
	59	sdata_info(sdata,
	60	"cannot understand ECSA IE operating class %d, disconnecting\n",
	61	elems->ext_chansw_ie->new_operating_class);
	62	return -EINVAL;
	63	}
	64	new_chan_no = elems->ext_chansw_ie->new_ch_num;
	65	*count = elems->ext_chansw_ie->count;
	66	*mode = elems->ext_chansw_ie->mode;
	67	} else if (elems->ch_switch_ie) {
	68	new_band = current_band;
	69	new_chan_no = elems->ch_switch_ie->new_ch_num;
	70	*count = elems->ch_switch_ie->count;
	71	*mode = elems->ch_switch_ie->mode;
	72	} else {
	73	/* nothing here we understand */
	74	return 1;
	75	}
	76
	77	new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
	78	new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
	79	if (!new_chan \|\| new_chan->flags & IEEE80211_CHAN_DISABLED) {
	80	sdata_info(sdata,
	81	"BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
	82	bssid, new_freq);
	83	return -EINVAL;
	84	}
	85
	86	if (!beacon && sec_chan_offs) {
	87	secondary_channel_offset = sec_chan_offs->sec_chan_offs;
88	} else if (beacon && ht_oper) {
89	secondary_channel_offset =
90	ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET;
91	} else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
92	/* If it's not a beacon, HT is enabled and the IE not present,
93	* it's 20 MHz, 802.11-2012 8.5.2.6:
94	* This element [the Secondary Channel Offset Element] is
95	* present when switching to a 40 MHz channel. It may be
96	* present when switching to a 20 MHz channel (in which
97	* case the secondary channel offset is set to SCN).
98	*/
99	secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
100	}
101
102	switch (secondary_channel_offset) {
103	default:
104	/* secondary_channel_offset was present but is invalid */
105	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
106	cfg80211_chandef_create(new_chandef, new_chan,
107	NL80211_CHAN_HT20);
108	break;
109	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
110	cfg80211_chandef_create(new_chandef, new_chan,
111	NL80211_CHAN_HT40PLUS);
112	break;
113	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
114	cfg80211_chandef_create(new_chandef, new_chan,
115	NL80211_CHAN_HT40MINUS);
116	break;
117	case -1:
118	cfg80211_chandef_create(new_chandef, new_chan,
119	NL80211_CHAN_NO_HT);
120	/* keep width for 5/10 MHz channels */
121	switch (sdata->vif.bss_conf.chandef.width) {
122	case NL80211_CHAN_WIDTH_5:
123	case NL80211_CHAN_WIDTH_10:
124	new_chandef->width = sdata->vif.bss_conf.chandef.width;
125	break;
126	default:
127	break;
128	}
129	break;
130	}
131
132	if (wide_bw_chansw_ie) {
133	new_vht_chandef.chan = new_chan;
134	new_vht_chandef.center_freq1 =
135	ieee80211_channel_to_frequency(
136	wide_bw_chansw_ie->new_center_freq_seg0,
137	new_band);
138
139	switch (wide_bw_chansw_ie->new_channel_width) {
140	default:
141	/* hmmm, ignore VHT and use HT if present */
142	case IEEE80211_VHT_CHANWIDTH_USE_HT:
143	new_vht_chandef.chan = NULL;
144	break;
145	case IEEE80211_VHT_CHANWIDTH_80MHZ:
146	new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
147	break;
148	case IEEE80211_VHT_CHANWIDTH_160MHZ:
149	new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
150	break;
151	case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
152	/* field is otherwise reserved */
153	new_vht_chandef.center_freq2 =
154	ieee80211_channel_to_frequency(
155	wide_bw_chansw_ie->new_center_freq_seg1,
156	new_band);
157	new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
158	break;
159	}
160	if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
161	new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
162	ieee80211_chandef_downgrade(&new_vht_chandef);
163	if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
164	new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
165	ieee80211_chandef_downgrade(&new_vht_chandef);
166	if (sta_flags & IEEE80211_STA_DISABLE_40MHZ &&
167	new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
168	ieee80211_chandef_downgrade(&new_vht_chandef);
169	}
170
171	/* if VHT data is there validate & use it */
172	if (new_vht_chandef.chan) {
173	if (!cfg80211_chandef_compatible(&new_vht_chandef,
174	new_chandef)) {
175	sdata_info(sdata,
176	"BSS %pM: CSA has inconsistent channel data, disconnecting\n",
177	bssid);
178	return -EINVAL;
179	}
180	*new_chandef = new_vht_chandef;
181	}
182
183	return 0;
184	}
185
39192c0b JB	186	static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
	187	struct ieee80211_msrment_ie *request_ie,
	188	const u8 da, const u8 bssid,
	189	u8 dialog_token)
	190	{
	191	struct ieee80211_local *local = sdata->local;
	192	struct sk_buff *skb;
	193	struct ieee80211_mgmt *msr_report;
	194
	195	skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
	196	sizeof(struct ieee80211_msrment_ie));
d15b8459	197	if (!skb)
39192c0b	198	return;
39192c0b JB	199
	200	skb_reserve(skb, local->hw.extra_tx_headroom);
	201	msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
	202	memset(msr_report, 0, 24);
	203	memcpy(msr_report->da, da, ETH_ALEN);
47846c9b	204	memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
39192c0b JB	205	memcpy(msr_report->bssid, bssid, ETH_ALEN);
	206	msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	207	IEEE80211_STYPE_ACTION);
	208
	209	skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
	210	msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
	211	msr_report->u.action.u.measurement.action_code =
	212	WLAN_ACTION_SPCT_MSR_RPRT;
	213	msr_report->u.action.u.measurement.dialog_token = dialog_token;
	214
	215	msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
	216	msr_report->u.action.u.measurement.length =
	217	sizeof(struct ieee80211_msrment_ie);
	218
	219	memset(&msr_report->u.action.u.measurement.msr_elem, 0,
	220	sizeof(struct ieee80211_msrment_ie));
	221	msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
	222	msr_report->u.action.u.measurement.msr_elem.mode \|=
	223	IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
	224	msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
	225
62ae67be	226	ieee80211_tx_skb(sdata, skb);
39192c0b JB	227	}
	228
	229	void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
	230	struct ieee80211_mgmt *mgmt,
	231	size_t len)
	232	{
	233	/*
	234	* Ignoring measurement request is spec violation.
	235	* Mandatory measurements must be reported optional
	236	* measurements might be refused or reported incapable
	237	* For now just refuse
	238	* TODO: Answer basic measurement as unmeasured
	239	*/
	240	ieee80211_send_refuse_measurement_request(sdata,
	241	&mgmt->u.action.u.measurement.msr_elem,
	242	mgmt->sa, mgmt->bssid,
	243	mgmt->u.action.u.measurement.dialog_token);
	244	}